US Patent: 97,767
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| Improvement in pumps
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Patentee:
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| Joseph W. Douglas (exact or similar names) - Middletown, CT |
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Patent Dates:
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| Granted: |
Dec. 14, 1869 |
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Jeff Joslin
Vintage Machinery entry for W. & B. Douglas
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Description: |
| "The invention consists in lining the air-chamber and the contiguous passages of pumps and hydraulic rams, and their equivalents, with a lining of porcelain or earthen material, which shall prevent the metal from rusting, and preserve, at the same time, the water from being diffused with particles of iron-rust and colored, and thus deteriorated." |
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